RF Matching Circuit for Tire Pressure Sensors
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing tire pressure sensor systems face challenges with high power consumption and increased costs due to the need for switching circuits to adjust impedance for different frequencies, affecting circuit efficiency and inventory management.
Innovation Solution
A radio frequency (RF) matching device for tire pressure sensors comprising a system control unit, RF control unit, RF matching unit, and multi-frequency antenna, which uses a resonance portion, filtering portion, and matching portion with passive elements to adjust frequencies and suppress noise without switching elements, allowing efficient transmission of multiple frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a switching circuit is used to switch between matching circuits for different frequencies, then the tire pressure sensor can support multiple frequencies, but the power consumption increases and circuit operation efficiency decreases
Solution Approach 1:
The patent implements a universal matching circuit that can handle multiple frequencies (315MHz and 433.92MHz) simultaneously without requiring switching between different circuit configurations. The circuit uses fixed passive components designed with impedance values that provide effective matching across both frequency bands, eliminating the need for frequency-selective switching and reducing power consumption while maintaining multi-frequency adaptability
2Adaptability or versatility
If a switching circuit is used to adjust impedance for different frequencies, then the antenna can transmit signals at different frequencies, but the cost increases
Solution Approach 1:
The patent employs a universal matching circuit with fixed passive components that provides effective impedance matching for both 315MHz and 433.92MHz frequencies simultaneously. This eliminates the need for expensive switching circuits, microcontroller units, and associated control logic, thereby reducing component costs and simplifying the manufacturing process while maintaining frequency adaptability
Solution Approach 2:
The patent extracts and eliminates the switching mechanism from the matching circuit design. By removing the switching circuit, microcontroller unit, and related control components, the design achieves multi-frequency support through a simplified fixed circuit topology, reducing both component count and manufacturing complexity
3Adaptability or versatility
If a switching circuit is used to switch between matching circuits, then different frequencies can be transmitted, but the circuit operation efficiency is reduced
Solution Approach 1:
The patent implements a universal matching circuit that operates efficiently across multiple frequencies without requiring switching operations. The fixed circuit topology with carefully selected passive components provides continuous effective matching for both 315MHz and 433.92MHz signals, eliminating switching delays, control overhead, and operational complexity, thereby maintaining high circuit operation efficiency while supporting multiple frequencies
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution reduces power consumption and costs, improves circuit efficiency, and extends battery life by eliminating the need for switching elements, enabling effective multi-frequency signal transmission with reduced noise and interference.
Implementation Method 1
The resonance unit is connected to the RF control unit to be adjusted to the required initial frequency and cut-off frequency of various frequency bands
Implementation Method 2
The filter unit is connected between the resonance unit and the matching unit to suppress and eliminate noise and unwanted frequency-doubling signals
Implementation Method 3
The matching unit allows the maximum power of the multi-frequency RF signal to be transferred to the multi-frequency antenna
Data Source
AI summary
The invention discloses a radio frequency (RF) matching device for a tire pressure sensor, which includes a system control unit, a RF control unit, a RF matching unit, and a multi-frequency antenna in order, wherein the RF matching unit includes a resonance portion, a filtering portion, and a matching portion in order, wherein the resonance unit is connected to the RF control unit to be adjusted to the required initial frequency and cut-off frequency of various frequency bands; the filter unit is connected between the resonance unit and the matching unit to suppress and eliminate noise and unwanted frequency-doubling signals; the matching unit allows the maximum power of the multi-frequency RF signal to be transferred to the multi-frequency antenna, so that the multi-frequency antenna can transmit multiple RF signals of different frequencies.